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Getting started with STEVAL-6986YT2DL evaluation board, 5 W dual isolated
output, SIP7 compatible, isobuck-boost converter based on A69868I
Introduction
The
STEVAL-6986YT2DL
is an evaluation board based on A6986I. The
topology. The input voltage can go up to 24 V. Thanks to the embedded two secondary windings transformer, a dual isolated
output is available (around 20 V and around -5 V). the isolated output power can reach 5 W.
The peculiarity of this board is its compatibility with a SIP7 module both in terms of pinout and concerning the size.
Further flexibility is achieved by matching SIP7 modules with different output voltage pinouts (available on pins 4-5-6 or 5-6-7)
The
STEVAL-6986YT2DL
works at 250 kHz switching frequency and embeds all the standard protections offered by the A6986I
(against overvoltage, overcurrent and overtemperature events).
The embedded transformer offers 1.5 kV isolation.
Notice:
For dedicated assistance, submit a request through our online support portal at www.st.com/support.
UM3496 - Rev 1 - April 2025
For further information, contact your local STMicroelectronics sales office.
STEVAL-6986YT2DL
Figure 1.
STEVAL-6986YT2DL board
UM3496
User manual
implements an isobuck-boost
www.st.com
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Summary of Contents for ST STEVAL-6986YT2DL
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Page 1: Figure 1. Steval-6986Yt2Dl Board
The embedded transformer offers 1.5 kV isolation. Figure 1. STEVAL-6986YT2DL board Notice: For dedicated assistance, submit a request through our online support portal at www.st.com/support. UM3496 - Rev 1 - April 2025 www.st.com For further information, contact your local STMicroelectronics sales office. -
Page 2: Getting Started
UM3496 Getting started Getting started Safety instructions This board is intended for use by skilled technical personnel who are suitably qualified and familiar with the installation, use and maintenance of power electronic systems. The same personnel must be aware of and must apply national accident prevention rules. -
Page 3: How To Use The Board
SIP7 module is used. The simplicity of a plug&play test is depicted in Figure Figure 3. STEVAL-6986YT2DL as replacement of a SIP7 module In case the STEVAL-6986YT2DL is tested with standard lab equipment, the... -
Page 4: Connectors And Test Points
UM3496 Connectors and test points Connectors and test points This connector is the only one available on the board and is used for the input supply voltage as well the isolated output voltages. Figure 5 shows which signal each pin of the connector J1 is connected to. Figure 5 shows the corresponding pin numbers at PCB level. -
Page 5: Schematic Diagrams
Schematic diagrams Figure 6. STEVAL-6986YT2DL circuit schematic VIS O+ ZD2020-AE GNDis o S YNCH RS T FS W A6986I FS W VOUT VBIAS S S /INH GND1 COMP DELAY S GND P GND P GND VIS O- VOUT GND1 VIS O-... -
Page 6: Bill Of Materials
UM3496 Bill of materials Bill of materials Table 1. STEVAL-6986YT2DL bill of materials Item Q.ty Ref. Part/value Description Manufacturer Order code CAP, AEC-Q200, 0.47UF, 16V, 470nF, 16V Taiyo Yuden EMK105ABJ474KVHF MLCC, 0402 Condensatore ceramico multistrato 68nF, 16V SMD, 0.068 µF, 16 V, 0402 [1005... -
Page 7: Table 2. Main Parameters Of The Transformer Zd202-Ae
UM3496 Bill of materials Item Q.ty Ref. Part/value Description Manufacturer Order code 0Ω Panasonic ERJ-S020R00X Resistore a chip SMD, 600 ohm, ± 1%, 500 mW, 0805 [2012 metrico], Vishay CRCW0805600RFKEAHP film spesso, alta potenza Resistore SMD, 4.7 kohm, ± 1%, 4.7kΩ... -
Page 8: Steval-6986Yt2Dl Layout
UM3496 STEVAL-6986YT2DL layout STEVAL-6986YT2DL layout The STEVAL-6986YT2DL is a 4-layer PCB with 1oz copper thickness. Figure 7. PCB layout (top) Figure 8. PCB layout (bottom) UM3496 - Rev 1 page 8/22... -
Page 9: Board Versions
UM3496 Board versions Board versions Table 3. STEVAL-6986YT2DL versions Finished good Schematic diagrams Bill of materials STV$6986YT2DL STV$6986YT2DL schematic diagrams STV$6986YT2DL bill of materials 1. This code identifies the STEVAL-6986YT2DL evaluation board first version. UM3496 - Rev 1 page 9/22... -
Page 10: Steval-6986Yt2Dl Performance
UM3496 STEVAL-6986YT2DL performance STEVAL-6986YT2DL performance Load regulation The load regulation is here defined under two different load configurations: • Balanced load, load connected between V and V ( the same current drawn from V is sourced ISO+ ISO- ISO+ to V... -
Page 11: Figure 14. Load Regulation Positive Output, Unbalanced Load, Option1
UM3496 STEVAL-6986YT2DL performance Figure 14. Load regulation positive output, Figure 15. Load regulation negative output, unbalanced load, option1 unbalanced load, option1 Iiso+ = 0 Iiso+ = 100mA Iiso+ = 0 Iiso+ = 100mA 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08... -
Page 12: Disclaimer
EMC compliance of the STEVAL-6986YT2DL is no longer ensured. Any change in the schematic, layout and BOM implemented by the user of the STEVAL-6986YT2DL are under the user’s responsibility. The recommended changes in the BOM described in the next chapters should be considered as possible application ideas in case the user wish to adapt the board to other typical application requirements. -
Page 13: Board Setting Capability
Typical SIP7 module pinouts (on the left the pinout provided by STEVAL-6986YT2DL 5 6 7 4 5 6 Nevertheless, the STEVAL-6986YT2DL can be easily adapted to match the other configuration. Some setting resistors (simple 0 Ω resistor) are available on the board (see Figure 18. Input EMC filter circuitry). -
Page 14: Optional Emc Filter
Optional EMC filter Optional EMC filter Very often the STEVAL-6986YT2DL will be placed in an application where an input EMC filtering is already foreseen. If this assumption is not valid or it is necessary to implement a further filtering, the filter shown in... -
Page 15: Edesignsuite
The eDesignSuite software available on the www.st.com website helps in the selection of the devices as well as in the design of the external components suitable for a certain application. After inserting the application conditions, the device can be selected and the design of the external components is automatically carried out. -
Page 16: Application Idea
UM3496 Application idea Application idea Changing the transformer for GaN gate drivers compatibility The BOM described in Section 5: Bill of materials is defined for application requiring two voltages, one positive and one negative, respectively around 20 V and -5 V. These voltages are commonly used by SiC MOSFET gate drivers. -
Page 17: Regulatory Compliance Information
UM3496 Regulatory compliance information Regulatory compliance information Notice for US Federal Communication Commission (FCC) For evaluation only; not FCC approved for resale FCC NOTICE - This kit is designed to allow: (1) Product developers to evaluate electronic components, circuitry, or software associated with the kit to determine whether to incorporate such items in a finished product and (2) Software developers to write software applications for use with the end product. -
Page 18: Revision History
UM3496 Revision history Table 7. Document revision history Date Revision Changes 04-Apr-2025 Initial release. UM3496 - Rev 1 page 18/22... -
Page 19: Table Of Contents
STEVAL-6986YT2DL performance ........ -
Page 20: List Of Tables
STEVAL-6986YT2DL bill of materials ........ -
Page 21: List Of Figures
STEVAL-6986YT2DL as replacement of a SIP7 module........ - Page 22 ST’s terms and conditions of sale in place at the time of order acknowledgment. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of purchasers’...
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